first commit

src/App.Core/Entities/Inventory/Part.cs

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+namespace App.Core.Entities.Inventory;
+
+/// <summary>Pièce détachée du magasin.</summary>
+public class Part
+{
+    public int Id { get; set; }
+
+    public required string Reference { get; set; }
+
+    public required string Designation { get; set; }
+
+    /// <summary>
+    /// Quantité en stock, dénormalisée pour un accès rapide côté UI/dashboard.
+    /// Source de vérité recalculable à tout moment depuis <see cref="StockMovement"/>.
+    /// </summary>
+    public double QuantityInStock { get; set; }
+
+    public double AlertThreshold { get; set; }
+
+    public string? Location { get; set; }
+
+    public int? PrimarySupplierId { get; set; }
+
+    public Supplier? PrimarySupplier { get; set; }
+
+    public decimal UnitPrice { get; set; }
+
+    public int? PhotoAttachmentId { get; set; }
+
+    public bool IsActive { get; set; } = true;
+}